• 한국정보통신학회논문지
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• 제25권4호
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• pp.530-536
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• 2021

LBP 알고리즘은 지역적 질감표현이라는 특성을 가지고 있기 때문에 기준영상과 샘플 영상의 추출 위치와 크기에 따라 전혀 다른 결과를 얻을 수 있다. 이러한 단점을 해결하기 위하여 본 논문에서는 먼저 LBP 기본특성을 조사하고, 기준영상(100×100)의 크기를 영상내의 대부분의 특성을 포함할 수 있도록 하고, 임의의 지점에서 추출된 샘플영상(40×40)을 선택한다. 기준영상의 LBP와 샘플영상의 LBP 간의 상관관계를 이용하여 기준영상의 LBP에서의 매칭위치를 찾은 후, 카이분석 방법을 사용하여 샘플영상과 가장 일치하는 기준영상을 찾는 방법을 제시한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.740-743
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• 1997

Reference models are used in many control algorithms for improvement of transient response characteristics. They provide desired trajectories that the plant should follow. Most control systems have bounded control inputs to avoid saturation of the plant. If we design reference models that do not account for limits of control inputs, control performance of the system may be deteriorated. In this paper, therefore, the way of determining variable reference models for TDC(time delay control) technique is proposed. The variable reference model is determined based on the information of bounded control inputs and reference inputs. This proposed method is also verified by application to the position control experiment using the BLDC motor.

• Bulletin of the Korean Chemical Society
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• 제28권3호
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• pp.439-442
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• 2007

A solid state Hg(Au)/HgO reference electrode was prepared utilizing gold amalgam solid particles. Solid fine powder of the gold amalgam was prepared by chemical reduction of Au(III) with NaBH4 followed by reduction of Hg(II) in the presence of gold fine particles. The solid content in the suspension of the gold amalgam particles and fine mercury oxide particles in DMF containing PVC was precipitated by the addition of a large amount of water to give solid Hg(Au)/HgO/PVC mixture. After drying, the mixture was pressure-molded to a physically stable Hg(Au)/HgO composite reference electrode material. The electrochemical characteristics of the electrode as a reference electrode were very similar to an ordinary Hg/HgO reference electrode. The electrode material can be molded and fabricated in any desired shape and size. The surface can be renewed by a simple polishing process whenever contaminated or deactivated. The applicability of the electrode in the electrochemical detection of carbohydrates after anion exchange separation was evaluated.

• Nuclear Engineering and Technology
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• 제54권2호
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• pp.689-700
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• 2022

In the present study, iodine-131 S values (r_T ← thyroid) were calculated for 30 target organs and tissues using the most recently developed Korean reference computational phantoms. The calculated S values were then compared with those of the International Commission on Radiological Protection (ICRP) reference computational phantoms to investigate the dosimetric impact of the Korean S values against those of the ICRP reference phantoms. The results showed significant differences in the S values due to the different anatomical/morphological characteristics between the Korean and ICRP reference phantoms. Most target organs/tissues showed that the S values of the Korean reference phantoms are lower than those of the ICRP reference phantoms, by up to about 4 times (male spleen and female thymus). Exceptionally, three target organs/tissues (gonads, thyroid, and extrathoracic region) showed that the S values of the Korean reference phantoms are greater, by 1.5-3.7 times. We expect that the S values calculated in the present study will be beneficially used to estimate organ/tissue doses of Korean patients under radioiodine therapy.

• International journal of advanced smart convergence
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• 제12권1호
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• pp.70-75
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• 2023

With the recent proliferation of memory-intensive workloads such as deep learning, analyzing memory access characteristics for efficient memory management is becoming increasingly important. Since read and write operations in memory access have different characteristics, an efficient memory management policy should take into accountthe characteristics of thesetwo operationsseparately. Although some previous studies have considered the different characteristics of reads and writes, they require a modified hardware architecture supporting read bits and write bits. Unlike previous approaches, we propose a software-based management policy under the existing memory architecture for considering read/write characteristics. The proposed policy logically partitions memory space into the read/write area and the write area by making use of reference bits and dirty bits provided in modern paging systems. Simulation experiments with memory access traces show that our approach performs better than the CLOCK algorithm by 23% on average, and the effect is similar to the previous policy with hardware support.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.418-423
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• 1992

In this paper, a model reference adaptive control algorithm is applied to the design of the normal acceleration controller for missiles with nonminimum-phase characteristics. The method used in this paper is due to Ohkubo. In this scheme, a feedforward compensator is designed first so that the extended system becomes minimum-phase and after that an adaptive control algorithms is designed for the extended system. The feedforwrd compensator is obtained by solving the robust stabilization problem. It is shown that the performance of the designed controller is satisfied via computer simulation.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제52권10호
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• pp.425-430
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• 2003

A CMOS Voltage-Controlled Oscillator(VCO) for application at temperature stable system is designed. The VCO consists of bandgap voltage reference circuit, comparator, and voltage-to-current converter and the VCO has a temperature stable characteristics. The difference between simulated and calculated values is less than about 5% in output characteristics when the input voltage range is from 1V to 3.25V. The CMOS VCO has error less than about $\pm$0.85% in the temperature range from $-25^{\circ}C$ to $75^{\circ}C$.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제48권12호
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• pp.777-784
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• 1999

Since the ultra-high voltage power apparatus are recommended to withstand switching surge generated from the electric power system, the switching impulse voltage is generally used to verify this requirement at the testing laboratories. Recently, the international standard(IEC 60060-2) related to the high voltage measurement techniques is revised requiring a traceability of measuring system for high voltage measurements. In this paper, a reference divider for switching impulse voltage is developed satisfying the revised. IEC standard and the possibility of applications has been investigated. Therefore, the characteristics of the high and low voltage side resistor and the shielding ring have been analyzed including the step response characteristics of the prototype divider. Throughout various efforts, it is confirmed that our measuring device has shown compatible characteristics as a reference divider.

• 한국정보통신학회논문지
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• 제18권10호
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• pp.2345-2350
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• 2014

본 논문에서는 포트 임피던스가 75옴인 실내 디지털 TV (DTV)용 안테나의 특성 측정 방법에 대해 소개하였다. 일반적인 RF (혹은 마이크로파) 시스템과 측정 장비의 기준 임피던스는 거의 대부분 50옴이다. 이에 비해 실내 디지털 TV용 안테나의 기준 임피던스는 75옴이므로 기준 임피던스가 50옴인 측정 장비를 이용하여 직접 특성을 측정할 수 없다. 50옴을 기준으로 하는 장비를 이용하여 75옴에 적합하도록 설계된 안테나의 특성(임피던스, 복사패턴 및 이득)에 대한 측정방법을 소개하였다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.45-46
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• 2014

본 논문에서는 포트 임피던스가 75옴인 실내 디지털 TV (DTV)용 안테나의 특성 측정 방법에 대해 소개하였다. 일반적인 RF (혹은 마이크로파) 시스템과 측정장비의 기준 임피던스는 거의 대부분 50옴이다. 이에 비해 실내 디지털 TV용 안테나의 기준 임피던스는 75옴이므로 기준 임피던스가 50옴인 측정 장비를 이용하여 직접 특성을 측정할 수 없다. 50옴을 기준으로 하는 장비를 이용하여 75옴에 적합하도록 설계된 안테나의 특성(임피던스, 복사패턴 및 이득)을 측정방법에 대해 소개하였다.